Editors' Choice - Dealloying-Driven Cerium Precipitation on Intermetallic Particles in Aerospace Aluminium Alloys

Journal article (2021)

Authors

A. Kosari Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
M. Ahmadi Kavli institute of nanoscience Delft, QN/Zandbergen Lab
F.D. Tichelaar Kavli institute of nanoscience Delft
P. Visser Akzo Nobel
Y. Gonzalez Garcia Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
H.W. Zandbergen QN/Zandbergen Lab , Kavli institute of nanoscience Delft
H.A. Terryn Vrije Universiteit Brussel
J.M.C. Mol Team Arjan Mol - Mechanical, Maritime and Materials Engineering
Research Group
Team Yaiza Gonzalez Garcia (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2021 A. Kosari, M. Ahmadi, F.D. Tichelaar, P. Visser, Y. Gonzalez Garcia, H.W. Zandbergen, H.A. Terryn, J.M.C. Mol
DOI: https://doi.org/10.1149/1945-7111/abf50d
More Info
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Published Date

2021

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Yaiza Gonzalez Garcia

Abstract

Cerium-based compounds have been studied for decades as non-toxic candidates for the protection of aerospace aluminium alloys (AAs) like AA2024-T3. However, the complex heterogeneous microstructure of these alloys has hindered a thorough understanding of the subsequent stages of corrosion protection provided by this class of inhibitors. Thus, this work is devoted to unravelling the interaction mechanisms of different intermetallic particles (IMPs) in AA2024-T3 with cerium nitrate at the nanoscopic scale. This has been fulfilled through detailed top-view and cross-sectional analytical TEM investigations along with electrochemical evaluations. In line with our recent findings, we here report dealloying of IMPs as the main factor governing the rate of local cerium precipitation in contrast to micro-galvanic corrosion between IMPs and the surrounding matrix. Furthermore, we discuss a connection between the electrochemical response of the AA2024-T3 system and the morphological and compositional evolutions of individual IMPs including Al2CuMg, Al2Cu, Al7Cu2Fe(Mn) and Al76Cu6Fe7Mn5Si6 at different stages of a 96-h exposure.